django.db.utils.OperationalError Could not connect to server

问题:

I am not sure how to fix this issue

I have no idea why I am getting this error when I try to runserver:

Performing system checks...  System check identified no issues (0 silenced). Unhandled exception in thread started by  Traceback (most recent call last):   File "/Library/Python/2.7/site-packages/django/utils/autoreload.py", line 222, in wrapper     fn(*args, **kwargs)   File "/Library/Python/2.7/site-packages/django/core/management/commands/runserver.py", line 107, in inner_run     self.check_migrations()   File "/Library/Python/2.7/site-packages/django/core/management/commands/runserver.py", line 159, in check_migrations     executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])   File "/Library/Python/2.7/site-packages/django/db/migrations/executor.py", line 17, in __init__     self.loader = MigrationLoader(self.connection)   File "/Library/Python/2.7/site-packages/django/db/migrations/loader.py", line 49, in __init__     self.build_graph()   File "/Library/Python/2.7/site-packages/django/db/migrations/loader.py", line 184, in build_graph     self.applied_migrations = recorder.applied_migrations()   File "/Library/Python/2.7/site-packages/django/db/migrations/recorder.py", line 59, in applied_migrations     self.ensure_schema()   File "/Library/Python/2.7/site-packages/django/db/migrations/recorder.py", line 49, in ensure_schema     if self.Migration._meta.db_table in self.connection.introspection.get_table_list(self.connection.cursor()):   File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 165, in cursor     cursor = self.make_debug_cursor(self._cursor())   File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 138, in _cursor     self.ensure_connection()   File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 133, in ensure_connection     self.connect()   File "/Library/Python/2.7/site-packages/django/db/utils.py", line 94, in __exit__     six.reraise(dj_exc_type, dj_exc_value, traceback)   File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 133, in ensure_connection     self.connect()   File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 122, in connect     self.connection = self.get_new_connection(conn_params)   File "/Library/Python/2.7/site-packages/django/db/backends/postgresql_psycopg2/base.py", line 134, in get_new_connection     return Database.connect(**conn_params)   File "/Library/Python/2.7/site-packages/psycopg2/__init__.py", line 164, in connect     conn = _connect(dsn, connection_factory=connection_factory, async=async) django.db.utils.OperationalError: could not connect to server: Connection refused         Is the server running on host "127.0.0.1" and accepting         TCP/IP connections on port 5432? 

When I try to connect to postgres:

psql: could not connect to server: No such file or directory         Is the server running locally and accepting         connections on Unix domain socket "/tmp/.s.PGSQL.5432"? 

settings.py:

DATABASES = {     'default': {         'ENGINE': 'django.db.backends.postgresql_psycopg2',         'NAME': 'beerad',         'USER': 'bli1',         'PASSWORD': '',         'HOST': '127.0.0.1',         'PORT': '5432',     } } 

回答1:

It can be some issues:

1. PostgreSQL is not running. Check it with sudo service postgresql status

2. Your PostgresSQl is not running on port 5432. You can check it typing sudo netstat -nl | grep postgres

3. You have something wrong trying to connect to your db like the username, the password or the databasename. Check that they are what postgres ask for you to connect it and that is the db_name that you want to access to.

4. Problems with postmaster.pid in postgres. It can happen because of a shutdown unproperly done. It makes to remind a pid alive that doesn't allow your server start. To fix it you have to:

    * rm /usr/local/var/postgres/postmaster.pid   * pg_resetxlog -f /usr/local/var/postgres 

   After this it should run properly if you make the runserver of postgres

Help in Mac OSX: How to start PostgreSQL server on Mac OS X?

回答2:

Try killing all postgres processes. Im on a MAC and this solution that I've found on ubuntus forum really works.

https://askubuntu.com/questions/547434/how-to-nicely-stop-all-postgres-processes

回答3:

For Windows

Go to search bar and just write "Open psql" and hit Enter.

Once screen is opened, rerun django project.

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